<?xml version="1.0" encoding="UTF-8"?>
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"
    xmlns:epub="http://www.idpf.org/2007/ops">
    <head>
        <title>switch invalid</title>
    </head>
    <body>
        <epub:switch id="mathmlSwitch">
            <!-- epub:default is missing -->
            <epub:case required-namespace="http://www.example.org/inline"
                xmlns:foo="http://www.example.org/inline"> foo <foo:span>bar</foo:span>
                <em>baz</em>
            </epub:case>
        </epub:switch>
    </body>
</html>
